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The role of long-lived dark states in the photoluminescence dynamics of poly(phenylene vinylene) conjugated polymers. II. Excited-state quenching versus ground-state depletion
The two pulse fluorescence bleaching experiments reported in an earlier paper [J. Chem. Phys. 117, 454 (2002)] are reanalyzed in the context of additional experiments. The fluorescence bleaching obser...

Polaron–excitons and electron–vibrational band shapes in conjugated polymers

J. Chem. Phys. 118, 4291 (2003); doi:10.1063/1.1543938

Issue Date: 1 March 2003

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Stoyan Karabunarliev and Eric R. Bittner
Department of Chemistry and Center for Materials Chemistry, University of Houston, Houston, Texas 77204-5003
The neutral excitations in poly(p-phenylenevinylene) are studied in conjunction with the vibronic structure of the lowest optical transitions. Combining the configuration interaction of Wannier-localized electron–hole pairs with an empirical description of electron–phonon coupling, we obtain the potential energy surfaces of monoexcited states and the Condon electron–vibrational spectra in absorption and emission. The S1-->S0 luminescence band shape is found compatible with self-localization of S1 within about 10 monomers, driven exclusively by electron–phonon coupling. The singlet and triplet polaron–excitons are exchange–split by about 1 eV and differ substantially in terms of average electron–hole separation. ©2003 American Institute of Physics.
History: Received 30 September 2002; accepted 13 December 2002
Permalink: http://link.aip.org/link/?JCPSA6/118/4291/1
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KEYWORDS and PACS

Keywords
PACS
  • 71.38.-k
    Polarons and electron–phonon interactions
  • 71.35.-y
    Excitons and related phenomena
  • 63.20.Kr
    Phonon–electron and phonon–phonon interactions
  • 78.55.Kz
    Photoluminescence in solid organic materials
  • YEAR: 2003

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0021-9606 (print)   1089-7690 (online)
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